[中學] 甄選題
(1)若z1,z2都是複數,已知z1=(-1+3i)/(1+i),且|z2|+2(z2bar)=z1,求z2= ?
Ans 4/3-i,1-i
我解出來得到z2=4/3-i,-i,但是4/3-i帶回去方程式又不合
(2)k€R,方程式x^2+kx+x+2=0有二實根a,b,則a^2+b^2的最小值為何?
Ans 10-4根號3
(3)若S不為空集合,且S包含於{1,2,3,4,5,6}且若a€S,則6-a€S,則此種集合S共有幾種?
Ans 7種
(4)利用根與係數,若a,b,c是異於零的互異實數,且a^3x+a^2y+az=1,b^3x+b^2x+by=1
,c^3x+c^2y+cz=1,則x=?,y=?,z=?
這題沒給答案
懇請解惑謝謝
符號不會打..沒時間研究抱歉
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